package Test_2019_2_19;

import com.alibaba.fastjson.JSONObject;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.regex.Pattern;

public class Test1 {
    public static void main(String[] args) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("1", 11);
        map.put("2", 22);
        map.put("3", 33);
        map.put("4", 44);
        for (String key : map.keySet()) {
            System.out.println(key);
        }
    }
}
